The WLtoys might be fixable. Some of their models like the bigger 1/14 to 1/10 stuff, they have full aluminum kits. But its from directly from them coming out of China or somewhere over there, and all those metal upgrades, deff not worth it. Some places are ok, some are not. Places like steering...
Really the only thing is mini z. There are mini z, and there is a 4x4 mini z platform. Not totally sure tho.
Traxxas / Latrax has small scale stuff
1/24 stuff like small scale crawlers and such.
Other than that, there isn't really anything that small scale that is hobby grade.
It's not 1:28...